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Segmentation fault when I use afl fuzzer


By : DeVito
Date : September 15 2020, 05:00 PM
To fix this issue I am having an issue figuring out what wrong with my code below. I run the full code and I do a lot of input testing and errors are being handled as I want them to. I also use stuffs like valgrind, cppchecker to check for bugs which I fixed the bugs. I then decided to use afl-fuzzer to do an advanced bug detection on my codes and then I get a lot of crashes due to the below line of code. However, most of the crashes are due to segmentation fault. but I don't seem to see what is wrong with the code. Any help will be appreciated. Below is the function that keeps giving the error. Which I think has to do with sscanf: , The primary problem is in the lines:
code :
char* name = malloc(sizeof(char) * 20);

if (2 != sscanf(command, "i %d %20s", &age, name)){


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Can someone tell me why my code generates a segmentation on SPOJ? and what is the segmentation fault error ?(FCTRL2)


By : brianin3d
Date : March 29 2020, 07:55 AM
I wish this helpful for you If you replace the return type of the function multiply from string to void the segfault is gone.
A segmentation fault happens when you try to read/write memory you don't have access to. For instance you can try writing on read only memory, or reading at address 0x00000000. A common way to achieve segfaults is by using an uninitialized pointer.

segmentation fault handler crashes with segmentation fault


By : Itz King Kaddy Sugar
Date : March 29 2020, 07:55 AM
it should still fix some issue The problem was the memory corruption performing operations inside the handler

strtok segmentation fault, just gives a segmentation fault when the first line of input file is blank


By : Andrew Sol
Date : March 29 2020, 07:55 AM
help you fix your problem Please use sscanf() instead. Try to avoid strtok() at all costs unless otherwise absolutely neccessary.
Here is a link to source you might find useful

When I compile my program,it displays "segmentaion fault (or) segmentation fault(core dumped)


By : user2823464
Date : March 29 2020, 07:55 AM
around this issue When I compile my program, it displays , Replace
code :
array<array<int , 5>,5> chessBoard = {};
array<array<int,8>,8> chessBoard;

Difference between segmentation fault and segmentation fault core dumped


By : UwemGray
Date : March 29 2020, 07:55 AM
To fix the issue you can do A core dump is a file containing a dump of the state and memory of a program at the time it crashed. Since core dumps can take non-trivial amounts of disk space, there is a configurable limit on how large they can be. You can see it with ulimit -c.
Now, when you get a segmentation fault, the default action is to terminate the process and dump core. Your shell tells what has happened, if a process has terminated with a segmentation fault signal it will print Segmentation fault, and if that process has additionally dumped core (when the ulimit setting and the permissions on the directory where the core dump is to be generated allow it), it will tell you so.
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